TanStack Query (React Query) is an open-source state management library for React applications. It handles caching, background updates, and stale data out of the box with zero configuration, making it ideal to use with Supabase-js and auto-generated REST APIs. The article provides a step-by-step guide on how to integrate TanStack Query with Next.js, including creating a React Query client, generating TypeScript types for database schema, creating Supabase clients for both client and server components, automating query key management with Supabase Cache Helpers, and writing reusable queries. The conclusion emphasizes that using React Query with Server Components makes sense in specific scenarios, such as migrating to Server Components without rewriting data fetching or needing a familiar programming paradigm while benefiting from Server Components.